[vtkusers] Writing a JPEG from vtkActor

[Amy Squillacote]

At 11:30 AM 12/20/2005, Dominik Szczerba wrote:

> >
> > I always have to check the source code to see which way it should go.
> > Could I suggest adding a simpler API like:
> >
> >  SetOutputRange(lowValue, highValue)?
>
>
>I strongly second the notion.
>Dominik

So this suggestion doesn't get lost, please add 
this as a feature request to the bug tracker: 
http://public.kitware.com/Bug/.  (You'll need to 
create an account for yourself in the bug tracker 
in order to add a bug / feature request.)

- Amy

> >
> >>
> >>
> >>>   vtkPNGWriter* writer = vtkPNGWriter::New();
> >>>   writer->SetInput(iss->GetOutput());
> >>>   writer->SetFileName(argv[2]);
> >>>   writer->Write();
> >>>
> >>> Always the first scalar is taken, regardles of explicit selection with
> >>> setActiveScalarrs. The info seems displayed properly (of the first
> >>> scalar) whih is in my case -9.11732e-06 1.53533e-05, output is black
> >>> image (empty histogram).
> >>> I will be grateful if you shed some light on this mystery.
> >>> Dominik
> >>>
> >>> Amy Squillacote wrote:
> >>> > Try using vtkImageShiftScale instead.  Do something like the
> >>> following.
> >>> >
> >>> > double range[2];
> >>> > grid->GetCellData()->GetScalars("abc")->GetScalarRange(range);
> >>> >
> >>> > vtkImageShiftScale *iss = vtkImageShiftScale::New();
> >>> > iss->SetInput(grid);
> >>> > iss->SetOutputScalarTypeToUnsignedChar();
> >>> > iss->SetShift(-range[0]);
> >>> > iss->SetScale((range[1] - range[0]) / 256.0);
> >>> >
> >>> > Are you sure that the data in your grid (a vtkImageData, I assume)
> >>> is in
> >>> > cell data? It's usually in point data.
> >>> >
> >>> > - Amy
> >>> >
> >>> > At 09:44 AM 12/20/2005, Dominik Szczerba wrote:
> >>> >
> >>> >> Thanks a lot, yes, I am trying the vtkImageCast, compiles fine,
> >>> but get
> >>> >> a black image at the end. Shouldnt I set ranges somewhere?
> >>> >> I can do
> >>> >>
> >>> >> grid->GetCellData()->GetScalars("abc")->GetRange())
> >>> >>
> >>> >> but where do I plug the output?
> >>> >>
> >>> >> Dominik
> >>> >>
> >>> >> Amy Squillacote wrote:
> >>> >> > Try using either vtkImageCast or vtkImageShiftScale to change your
> >>> >> image
> >>> >> > data to contain either unsigned char or unsigned short data.
> >>> >> >
> >>> >> > - Amy
> >>> >> >
> >>> >> > At 08:58 AM 12/20/2005, Dominik Szczerba wrote:
> >>> >> >
> >>> >> >> What is the error? I try to do the same with vtkPNGWriter
> >>> ending up
> >>> >> with:
> >>> >> >>
> >>> >> >> vtkPNGWriter (0x8058948): PNGWriter only supports unsigned char
> >>> and
> >>> >> >> unsigned short inputs
> >>> >> >>
> >>> >> >> Meanwhile I try to figure out how to do the appropriate
> >>> convertion in
> >>> >> >> vtk.
> >>> >> >> --dsz
> >>> >> >>
> >>> >> >> Marlos Fabris wrote:
> >>> >> >> > Hi,
> >>> >> >> >
> >>> >> >> > I'm trying to write a jpeg file (using vtkJPEGWriter) from a
> >>> >> vtkActor
> >>> >> >> > but I can't accomplish this. I have a vtk file with structured
> >>> >> points
> >>> >> >> > data and I wish to transform to vtkPolyData and color it with my
> >>> >> >> > vtkLookupTable.
> >>> >> >> >
> >>> >> >> > Is there a way to convert only my vtkActor to a vtkImageData,
> >>> >> without
> >>> >> >> > the frameborders of vtkWindowToImageFilter?
> >>> >> >> >
> >>> >> >> > Or is there a way to trim my image?
> >>> >> >> >
> >>> >> >> > Thank you in advance,
> >>> >> >> >
> >>> >> >> > Marlos Fabris
> >>> >> >> > _______________________________________________
> >>> >> >> > This is the private VTK discussion list.
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> >>> >> >>
> >>> >> >> --
> >>> >> >> Dominik Szczerba, Dr.
> >>> >> >> ETZ C110 CO-ME/BIWI CH-8092 Zurich
> >>> >> >> http://www.vision.ee.ethz.ch/~domi
> >>> >> >> _______________________________________________
> >>> >> >> This is the private VTK discussion list.
> >>> >> >> Please keep messages on-topic. Check the FAQ at:
> >>> >> >> http://www.vtk.org/Wiki/VTK_FAQ
> >>> >> >> Follow this link to subscribe/unsubscribe:
> >>> >> >> http://www.vtk.org/mailman/listinfo/vtkusers
> >>> >>
> >>> >> --
> >>> >> Dominik Szczerba, Dr.
> >>> >> ETZ C110 CO-ME/BIWI CH-8092 Zurich
> >>> >> http://www.vision.ee.ethz.ch/~domi
> >>> >> _______________________________________________
> >>> >> This is the private VTK discussion list.
> >>> >> Please keep messages on-topic. Check the FAQ at:
> >>> >> http://www.vtk.org/Wiki/VTK_FAQ
> >>> >> Follow this link to subscribe/unsubscribe:
> >>> >> http://www.vtk.org/mailman/listinfo/vtkusers
> >>>
> >>> --
> >>> Dominik Szczerba, Dr.
> >>> ETZ C110 CO-ME/BIWI CH-8092 Zurich
> >>> http://www.vision.ee.ethz.ch/~domi
> >>> _______________________________________________
> >>> This is the private VTK discussion list.
> >>> Please keep messages on-topic. Check the FAQ at:
> >>> http://www.vtk.org/Wiki/VTK_FAQ
> >>> Follow this link to subscribe/unsubscribe:
> >>> http://www.vtk.org/mailman/listinfo/vtkusers
> >>
> >>
> >> _______________________________________________
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> >
> >
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>
>--
>Dominik Szczerba, Dr.
>ETZ C110 CO-ME/BIWI CH-8092 Zurich
>http://www.vision.ee.ethz.ch/~domi
>_______________________________________________
>This is the private VTK discussion list.
>Please keep messages on-topic. Check the FAQ at: 
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